We all wonder where we really come from, and especially on Heritage Day, when in some workplaces, we’re asked to don our “national costume”. My heritage is pretty mixed, so a Union Jack with some Dutch orange, a Greek bolero and a four-leaf clover for luck would do it, albeit a little peculiar.

The search for identity has driven some of us to genetic ancestry testing. But can it really tell you who you are? It definitely cannot, says Prof Himla Soodyall, executive officer of the Academy of Science of SA (ASSAf), and a research professor in human genetics at the University of the Witwatersrand. And nor can it detect your race...

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